What it was: Sony's format for pint-sized recordable audio discs, introduced in 1992. The idea was that it combined the best qualities of compact discs and cassette tapes into one high-quality, portable package that could contain up to 80 minutes of music.

What happened: MiniDisc found some fans--it was popular in Asia, and among musicians. But it never gained much support from the music industry, so few prerecorded albums were available. And within a few years of its introduction, it found itself competing with digital downloads. While Sony introduced NetMD, a MiniDisc variant that supported MP3, the company made it remarkably unappealing by adding copy protection to your tracks as you transferred them to disc. Why would you choose NetMD when a multitude of players, such as those from Diamond and Creative, let MP3s be MP3s? Good question!

Current whereabouts: In 2004, Sony upgraded the MiniDisc format with Hi-MD, a higher-capacity, more flexible standard that was backwards compatible with MiniDiscs. It garnered some admiration among audiophiles for the high quality of its recording capabilities. But as of 2009, only one Hi-MD device remains in Sony's lineup, the MZ-M200. It's aimed at musicians and journalists who need to make recordings on the go. The moment it disappears, we can officially declare MiniDisc dead.

Monochrome Displays

What they were: The black-and-white CRT that most businesses and many homes used with computers from the 1970s through the late 1980s--and they worked just fine, since most DOS applications made little use of color, and early Macs didn't support it at all.

What happened: Graphical user interfaces, multimedia, and games all made universal use of color inevitable, but it took a long time before it truly conquered computing. Well into the 1990s, lots of folks who wouldn't dream of using a black-and-white display with a desktop PC still toted monochrome notebooks. But today, even a $200 netbook has a perfectly respectable color display.

Current whereabouts: You don't want a monochrome display. But if you did, you wouldn't have trouble finding one--even Dell still stocks them. They're still out there in large quantities, being used for electronic cash registers and other unglamorous but important text-based applications. And hey, monochrome is making its own unexpected sort of comeback: My brand-new Kindle 2 e-book reader has an E-Ink screen that does 16 shades of gray, and nothing else.

Hercules

What it was: An extremely popular line of graphics cards for IBM PCs and compatibles. Hercules first appeared in 1982, the year after the IBM PC was launched, and was known for its high-quality text; it was as synonymous with graphics in the 1980s as Creative's Sound Blaster was with audio a decade later.

What happened: When fancy color graphics replaced spartan text displays, Hercules continued to be a prominent brand for years, though it never dominated as it did in the early years. But in 1998, it was bought out by competitor ELSA, which then went bankrupt and sold the Hercules brand to French tech company Guillemot. (In researching this article, I've come to the conclusion that one sale or merger is usually bad news for a venerable brand, and a second one is usually near-fatal.) Guillemot continued to make cards under the Hercules name for several years. But industry consolidation in the graphics biz was ongoing and brutal, and in 2004 it ceased production of them.

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

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